Web Service & serialization

Hi,
I want to serialize an object into a byte array to return it from a
Web Service and save it to a file (XML) at the client side. I've done
serialization and deserialization with a regular class and it works.
But when I send the byte array through the Web Service and try to save
it, I then discover, that the file is empty... However the service
client receives some data, because it writes:
Result = [B@13576a2

Here is my code:
------------------------------------------------------------------------
Web Service:
------------------------------------------------------------------------
package ws;

import javax.jws.WebMethod;
import javax.jws.WebService;
import java.io.*;
import java.beans.*;
import ws.*;
/**
 *
 * @author agata
 */
@WebService()
public class byte64Serwer {
    /**
     * Web service operation
     */
    @WebMethod
    public byte[] getXML() {
        XMLEncoder encoder = null;
        XMLDecoder decoder = null;
        ByteArrayOutputStream byteStream = new
ByteArrayOutputStream();
        byte[] byteArray = null;

        Adres annapolis = new Adres("Annapolis", 35, 53, "30-170",
"Washington, D.C.");
        Osoba agata = new Osoba("Agata", "Krawcewicz", annapolis,
1982);
        Osoba tomek = new Osoba("Tomasz", "Staniszewski", annapolis,
1980);

        //do XML
        try
        {
            encoder = new XMLEncoder(
                           new BufferedOutputStream(
                           byteStream));
            System.out.println(agata);
            System.out.println(tomek);
            encoder.writeObject(agata);
            encoder.writeObject(tomek);
            byteArray = byteStream.toByteArray();
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        finally
        {
            if(encoder != null) encoder.close();
            return byteArray;
        }
    }

}

------------------------------------------------------------------------------
Client
------------------------------------------------------------------------------

package byte64client;

import java.io.*;

/**
 *
 * @author agata
 */
public class Main {

    /** Creates a new instance of Main */
    public Main() {
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String plik;
        FileOutputStream fstream = null;
        String home_path = System.getProperty( "user.home" );
        if(home_path.contains("/"))
        {
            plik = home_path + "/lista.xml";
        }
        else
            plik = home_path + "\\lista.xml";
        System.out.println("Bede zapisywal do pliku: " + plik);

        try { // Call Web Service Operation
            wsc.Byte64SerwerService service = new
wsc.Byte64SerwerService();
            wsc.Byte64Serwer port = service.getByte64SerwerPort();
            // TODO process result here
            byte[] result = port.getXML();
            fstream = new FileOutputStream(plik);
            fstream.write(result);
            fstream.close();
            System.out.println("Result = " + result);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

}
==========================================
Am I taking a right approach? Or is it totally wrong? Sorry, but I'm a
newbie...
I can post the code for Adres and Osoba classes if it helps you if you
could run it all.
Anyway thanks for all your posts! :)